I issue monthly invoices for competition expenses for a kids sports organization, and issue monthly invoices to charge for registration fees and coaches fees (both are listed as separate products). We've adjusted our competition schedule which has increased our registration fees but reduced the coaches fees. I want to issue the next invoice to adjust for the differences and keep it all on one invoice if possible vs. issuing a separate credit memo for the reduction in coaches fees. But I'm not sure of the backend implications of doing this. I just want to be sure before I process 60 of these! Thank you!